var data_history_pres_schema = ['Start Year', 'End Year', 'President', 'First Lady', 'Vice President'];
var data_history_pres_data = [['START YEAR', 'END YEAR', 'PRESIDENT', 'FIRST LADY', 'VICE PRESIDENT'], 
['1789', '1797', 'George Washington', 'Martha Washington', 'John Adams'], 
['1797', '1801', 'John Adams', 'Abigail Adams', 'Thomas Jefferson'], 
['1801', '1805', 'Thomas Jefferson', 'Martha Wayles Skelton Jefferson', 'Aaron Burr'], 
['1805', '1809', 'Thomas Jefferson', 'Martha Wayles Skelton Jefferson', 'George Clinton'], 
['1809', '1812', 'James Madison', 'Dolley Madison', 'George Clinton'], 
['1812', '1813', 'James Madison', 'Dolley Madison', 'office vacant'], 
['1813', '1814', 'James Madison', 'Dolley Madison', 'Elbridge Gerry'], 
['1814', '1817', 'James Madison', 'Dolley Madison', 'office vacant'], 
['1817', '1825', 'James Monroe', 'Elizabeth Kortright Monroe', 'Daniel D. Tompkins'], 
['1825', '1829', 'John Quincy Adams', 'Louisa Catherine Adams', 'John C. Calhoun'], 
['1829', '1832', 'Andrew Jackson', 'Rachel Jackson', 'John C. Calhoun'], 
['1833', '1837', 'Andrew Jackson', 'Rachel Jackson', 'Martin Van Buren'], 
['1837', '1841', 'Martin Van Buren', 'Hannah Hoes Van Buren', 'Richard M. Johnson'], 
['1841', '1841', 'William Henry Harrison', 'Anna Tuthill Symmes Harrison', 'John Tyler'], 
['1841', '1845', 'John Tyler', 'Letitia Christian Tyler and Julia Gardiner Tyler', 'office vacant'], 
['1845', '1849', 'James K. Polk', 'Sarah Childress Polk', 'George M. Dallas'], 
['1849', '1850', 'Zachary Taylor', 'Margaret Mackall Smith Taylor', 'Millard Fillmore'], 
['1850', '1853', 'Millard Fillmore', 'Abigail Powers Fillmore', 'office vacant'], 
['1853', '1853', 'Franklin Pierce', 'Jane M. Pierce', 'William R. King'], 
['1853', '1857', 'Franklin Pierce', 'Jane M. Pierce', 'office vacant'], 
['1857', '1861', 'James Buchanan', '', 'John C. Breckinridge'], 
['1861', '1865', 'Abraham Lincoln', 'Mary Todd Lincoln', 'Hannibal Hamlin'], 
['1865', '1865', 'Abraham Lincoln', 'Mary Todd Lincoln', 'Andrew Johnson'], 
['1865', '1869', 'Andrew Johnson', 'Eliza McCardle Johnson', 'office vacant'], 
['1869', '1873', 'Ulysses S. Grant', 'Julia Dent Grant', 'Schuyler Colfax'], 
['1873', '1875', 'Ulysses S. Grant', 'Julia Dent Grant', 'Henry Wilson'], 
['1875', '1877', 'Ulysses S. Grant', 'Julia Dent Grant', 'office vacant'], 
['1877', '1881', 'Rutherford Birchard Hayes', 'Lucy Webb Hayes', 'William A. Wheeler'], 
['1881', '1881', 'James A. Garfield', 'Lucretia Rudolph Garfield', 'Chester A. Arthur'], 
['1881', '1885', 'Chester A. Arthur', 'Ellen Lewis Herndon Arthur', 'office vacant'], 
['1885', '1885', 'Grover Cleveland', 'Frances Folsom Cleveland', 'Thomas A. Hendricks'], 
['1885', '1889', 'Grover Cleveland', 'Frances Folsom Cleveland', 'office vacant'], 
['1889', '1893', 'Benjamin Harrison', 'Caroline Lavinia Scott Harrison', 'Levi P. Morton'], 
['1893', '1897', 'Grover Cleveland', 'Frances Folsom Cleveland', 'Adlai E. Stevenson'], 
['1897', '1899', 'William McKinley', 'Ida Saxton McKinley', 'Garret A. Hobart'], 
['1899', '1901', 'William McKinley', 'Ida Saxton McKinley', 'office vacant'], 
['1901', '1901', 'William McKinley', 'Ida Saxton McKinley', 'Theodore Roosevelt'], 
['1901', '1905', 'Theodore Roosevelt', 'Edith Kermit Carow Roosevelt', 'office vacant'], 
['1905', '1909', 'Theodore Roosevelt', 'Edith Kermit Carow Roosevelt', 'Charles W. Fairbanks'], 
['1909', '1912', 'William H. Taft', 'Helen Herron Taft', 'James S. Sherman'], 
['1912', '1913', 'William H. Taft', 'Helen Herron Taft', 'office vacant'], 
['1913', '1921', 'Woodrow Wilson', 'Ellen Axson Wilson and  Edith Bolling Galt Wilson', 'Thomas R. Marshall'], 
['1921', '1923', 'Warren G. Harding', 'Florence Kling Harding', 'Calvin Coolidge'], 
['1923', '1925', 'Calvin Coolidge', 'Grace Goodhue Coolidge', 'office vacant'], 
['1925', '1929', 'Calvin Coolidge', 'Grace Goodhue Coolidge', 'Charles G. Dawes'], 
['1929', '1933', 'Herbert Hoover', 'Lou Henry Hoover', 'Charles Curtis'], 
['1933', '1941', 'Franklin D. Roosevelt', 'Eleanor Roosevelt', 'John N. Garner'], 
['1941', '1945', 'Franklin D. Roosevelt', 'Eleanor Roosevelt', 'Henry A. Wallace'], 
['1945', '1945', 'Franklin D. Roosevelt', 'Eleanor Roosevelt', 'Harry S. Truman'], 
['1945', '1949', 'Harry S. Truman', 'Bess Wallace Truman', 'office vacant'], 
['1949', '1953', 'Harry S. Truman', 'Bess Wallace Truman', 'Barkley, Alben W.'], 
['1953', '1961', 'Dwight D. Eisenhower', 'Mamie Doud Eisenhower', 'Richard M. Nixon'], 
['1961', '1963', 'John F. Kennedy', 'Jacqueline Kennedy Onassis', 'Lyndon B. Johnson'], 
['1963', '1965', 'Lyndon B. Johnson', 'Lady Bird Johnson', 'office vacant'], 
['1963', '1969', 'Lyndon B. Johnson', 'Lady Bird Johnson', 'Hubert M. Humphrey'], 
['1969', '1973', 'Richard M. Nixon', 'Pat Nixon', 'Spiro T. Agnew'], 
['1973', '1974', 'Richard M. Nixon', 'Pat Nixon', 'Gerald R. Ford'], 
['1974', '1977', 'Gerald R. Ford', 'Betty Ford', 'Nelson Rockefeller'], 
['1977', '1981', 'Jimmy Carter', 'Rosalynn Carter', 'Walter F. Mondale'], 
['1981', '1989', 'Ronald Reagan', 'Nancy Reagan', 'George Bush'], 
['1989', '1993', 'George Bush', 'Barbara Bush', 'Dan Quayle'], 
['1993', '2001', 'Bill Clinton', 'Hillary Rodham Clinton', 'Albert Gore'], 
['2001', '2009', 'George W. Bush', 'Laura Bush', 'Richard Cheney'], 
['2009', '2016', 'Barack Obama', 'Michelle Obama', 'Joseph R. Biden']]